6x 6 4x 4 8 July 8, 2019 16 32 64 128 6 4x 6x 8x 4 4x 4 x 8 6x 6 180 4x 4 x 8 6x 6 (- 6x 8 14x 6 20x 4 4x 4 6xy - 4y + 6 - 9x
